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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6c8c4580c158ee72005dad79f4dfe6acb2e2d1a5cf1eb79dc49c0b75f23ac21' 
  AND token = 'w0ovIzMyajNjYA6b3gpt+pk6nFP6LdZpOmnTV0M2O+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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