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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1f31119a4700810bacd52f9f11a98bd3472a6e79f21272b46751dd671499999' 
  AND token = 'SWKX0/bET0tXUAt0TdWCY72gpnbVUzR1JTABsQt/GoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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