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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '293440e7342be390f28ae85774d086505343f77d88586e912e7a7ea2ef154240' 
  AND token = 'm6lIvO/3sa8X8RmJzdiYCc0utRjpCEsJ5O+F8NnkHl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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