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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '745037ff248624c604885fda5059d910d5e2f09613791eb200751eaf6fab5241' 
  AND token = 'F1ml3Wl33kbToK2U81njcSVOAyPNmo0A44OGfb0e9nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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