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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '989b4103b2e6926e985332c48e272ee3a811b19c3bf96f71fa1018bf2f4a2816' 
  AND token = 'S43TWIujTnzira0AGQ3wzUn/hM/9fIuMB37XHCv0Nc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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