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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed188f9aeabee4ef30149c2f4558a7e14536cdd6409ad1657a540fa69e522984' 
  AND token = '4xTgg5SVzuFJBthb7BUbxU/8OvCk8Dpxnd62sXvEvAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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