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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b08369a4abcb163eb9d223584dfe11f958d14ec636e2845167da653119fb566e' 
  AND token = 'gjdVXVm711s2XZetnEeIs9HvbT3mKeZzu8O2CR4QHi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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