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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afd1e3ff2c98517bd0e616c9b7c0427cb66484cd06804e1dd051fce1fdf19cc2' 
  AND token = 'PX2Y6DCJBYEfRmG3BYLKNENJI7NxMLFSBATZw9L75+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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