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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f71dcec13b21c95c0c129833edb9a45b3f8a5e19a9a616a4ad7bdd866bc6cb6a' 
  AND token = '0qr1MMs4VVtBXlxX6KMZblPb1zH9E9wM20QRHm527G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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