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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04ee3809503e0f3b9434700c8fad239616e014367d605d082b0d4b5cdef6af1b' 
  AND token = '6No3atyRUdsrY4k9sAjhIBPHUfzx/NWTXu3kVOl7Uws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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