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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8767b773f92f10e152cd9bb2c7be6ed606624ff58e031886be7ca72d293483e4' 
  AND token = 'Erj1jWxJNpm7os2OZ3pL0mr42KKXTixAPmdldR0cvGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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