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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '526676e1f06f503d2ef3f51ddd8897930ae9e15e6bb900106f72ded6620bdf34' 
  AND token = 'oE1VSmd/JLIINwVu4Qraa4K/YQ2+Sr/1OhmiWcGmQeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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