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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcad3215f6f2b3b1717d9dc80dd6eeb76cd166b8e10d8df1a5d4c9913106f6b8' 
  AND token = '50saUSumj4bgenIISmDMdyS/j1oEfXSUYIpOtb/ubGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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