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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce02240881bb0980f45a72c358e1b6a13816b13adbd76ac90898b3948e881350' 
  AND token = 'j2/tpNjd+w8hRkAoNY0Z9SMJaTj4iQizZU2wuTqD9ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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