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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '948753e62b3e3cae68d7a7217a38a500f3a046ea49ebff70f1076d3d596df525' 
  AND token = 'jG6DQZpxQL7MMEd/dJvaCUeVesny8QDfFRAxHyoASEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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