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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7de76e25071cebb662cdf1bb24975477488b0a6220fab685fc3a0dc1c4601f91' 
  AND token = 'FnBUci4IyUrqiv1Oj0iR2j7A+2Vp37ehdUWf5JPfqy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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