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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b07a51378d3526d533094e8a781ba467a82df9ce9d086e83a5ad8f03acd289c1' 
  AND token = 'dF4rbmbS8Yu2bDZRkSQQb+tRPMRlBFHpNykeFKRXMN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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