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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4055cf0635429d0baafeacba721951d9484a035f84af78662cabef7bdb8da86d' 
  AND token = '+jld+022XfNu2diWDm539R7JPjiKM7nuaPbsTkD0DSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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