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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf1d1392d324dd81107776cee07ddea0568ddb84cc205e92faac35052d77d792' 
  AND token = 'XVI5EVwmXakzUG2LvIl+q+dtCAXENd3KeMp6XdmoV3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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