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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79ae40a8b50582354ff8f1ae45d6f28eb0806782a640564c4fe93e6402225ef9' 
  AND token = '3unMpvM1oJEwCPAiWKDS6zNmsYTc/Iq85S7b1vSUaYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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