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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d0dc484e2ac1c5254984ee3c8afd22b1aa992168a8c6b73ce3e5154c12d0cff' 
  AND token = '0a1s0NapBXQjBSATLfdyi7wBoPASi32KjWVMWKXgp1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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