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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a89d9080cd5110986f0b77c79a3887642a393f0dc52ad07a0c9393c7a63440b3' 
  AND token = 'HDLSZgk36tKmbwev+8c3o3nRttebzA16Bm1L6Bz9+hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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