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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a29aca281ec6465a17f8e80cb2569594f9c2b8aed043b03d28e49c4490142af1' 
  AND token = '9ltIBc444DD6lBl3LK5qjobpaFzULEgvbu6+Ke5dymg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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