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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfe7c7d353a2f62a07350bb9e735b94c5537f986dd3f9572ff6adf4d33f7719f' 
  AND token = 'Aubjur5nWja94aKaD1r+4oOx4z8VAetQGbVswQC6Qc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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