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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4f374e005d16a679aa3d2f0dea76331da27f9be8d86a844fdb08ca4950648a8' 
  AND token = 'Jm9N6JsdDSeWDoB1rNflqPi2Ep3LTtPhBphmOSFPHzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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