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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cd045b14202478d8ac6e7ce6fe03dcce4f4c9dc443fe5cecd8abb7b93e01b08' 
  AND token = 'Dl8neNmuESBaf+ssRfQHNiZ6sVkJ2r8RoMzkyE6RXiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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