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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b095e2bf9476044b9ee7781aa38ee26368550ad62086b5736f02d2dc0db95e54' 
  AND token = 'McwrxIaacPgBzTEl+7lgCmMd+jMrDiZ5AWhrvJeA1I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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