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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31f01e435081f07c20262e5341cfc587c61d3ef4d89a3ee7b2f7c9ffe438be6d' 
  AND token = 'tNojrsYHKOCKNQ8rh7Zm6ixUK48okiocpvmehXwwsBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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