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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cba30dde88e4477586867a925e1a2f68719ba73c8e17a26b33262b343c7b28f1' 
  AND token = 'GGENzOuyXmkPBkCzk9aRWWIGpUlf34VveY4dV/o5rWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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