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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a535b45e47d46a331387740ab3b890fe57a68a0819bde00006d7e247a84232b9' 
  AND token = 'ttE3fWHuqODHNpa/ww01QsTYQlXmzwX9HxZvwipBNg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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