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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2c68ef5c7b2c82b0e2bda9fac52e951ac2384e1b328582518910c1882a1bf3a' 
  AND token = 'mrYqi8bvSPXmN9LFdV2zsreUtuJaEYmDJILPGNC+AUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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