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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7ec1d18833223188028d759500705887f2519bd6019d392d649ef52c2c30fd0' 
  AND token = 'lvFKG2MAMD28PKbRWZr/Jfq30dEOdyKY2EMXM4vA6R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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