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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daeb0fe4fab6af68ee0eae173e76a20c5a379f1da7ffaea8122512e1b4507e1d' 
  AND token = 'CaG1EWApkwV6JuJWa+0Ht/APUaxw9QvZdLPicz/7N4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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