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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ca3de1ccf4b6e1ab9f6f637cad027b2be00bcb18309a619e57c8c755e3c2b6' 
  AND token = 'l9bRL3uXdTaJ+93BbLprrOc98VGIA0YRJN2v78gHMXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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