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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be1d8eb04be3e87444fb97b0d39d8c0ff3c1b5167ccc70d184daa0aa2966a124' 
  AND token = 'JEO2tTj4Fg3lWnu1AVt2VdG58R7mFiVsOVKfkTG5Vwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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