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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccc320c867aa0e82da0ef82a55a7a208d2cf92b65664c5ce92867483abf558de' 
  AND token = '0vVdhq1u007hW6OijGe1ftGAPfAIhjjdL0fH1yVbd0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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