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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e02632f7694fbd5c98db98f702683ba392faadaca881d8e624a377bd2a53cee' 
  AND token = 'lXkFuZuNuAh228Jo/2sEXHN3F0I3y4sJtimPa0zZOx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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