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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed2af483dc547ec3159460fc52509b8b1d647427aabb527725764bf55ad4c86f' 
  AND token = 'RJVZSZfaTgpXl9NMKbytKRr2duo7flPPv0sTuU0Nql0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}