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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20231e9302ad7e9358d6a9d08952c733de52d11643c5b18cfab189944e8b7fd8' 
  AND token = 'fPTawxdKvAbW8wi78aO0Pjk0cP8RC7iZN6hzpJFlAIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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