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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb171336320d93f4cbc6a21e9b25129203fb4425109c8b4e250b0dbce05a3459' 
  AND token = 't+HF6NXYtkEBEFZ+IL50l2TkkDKrPRkvoja38dsW1CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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