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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8815f5d3f8ada791a685c47e8e0018c510ebee9e936af016d5b1e5047f129f18' 
  AND token = 'QCIT5CIQfAYyGYJ2Ro3i4i3ZyzWaqEcwr45xNKnNlAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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