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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '076e081d43cdf6ec4df16bc0a51649a64d12bee3d53b56ac487e0765af76d67c' 
  AND token = 'xsF1G4QO/ARxXq2Swecy5Y27+nkrROgmOwL5DnJ2aME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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