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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2c808918c184f1f460e7b16370a288ead20b80462dc3ca5d4b6c6e518130e3a' 
  AND token = 'k+uO55yheusUAcnkQeI30YvXYw3fJv0uOrgNE0XAEV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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